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UNITED STATES PATENT OFFICE. e

SAMUEL H. OROOKER, OF RAILTON, COLONY OF TASMANIA.

PROCESS OF ENGRAVING ON GLASS, 80C.

SPECIFICATION formingpart of Letters Patent No. 243,110, dated June 21, 1881.

Application filed April 30, 1881, (No specimens.) Patented inEuglish Colony of Victoria November 8, 1880 To all whom it may concern Be it known that I, SAMUEL HENRY CRooKER, a subject of the Queen of Great Britain, residing at Railton, in the British Colony of Tasmania, mechanical engineer, have invented a certain new and useful Im-' proved Process of Engraving on Glass or- Glassy Surfaces, (for which I have received Letters Patent in the British Colony of Victoria, N 0. 2,923, dated the 8th day of N oveniber, 1880;) and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

My improved process of engraving on glass or glassy surfaces may be applied either to the ornamentation of articles or to the production of blocks for typographical purposes. It consists, essentially, in drawing on said surfaces with an ink that will resist the subsequent action of fluoric acid, and that is sufficiently fluid for the purpose when used with a hot pen or with any other heated drawing-instrument.

The ink that I prefer to use is made of six parts, by weight, of wax and six parts of resin, melted together, with two parts of lamp-black, so as to be thoroughly incorporated the one with the other. Iwish, however, to state that there is nothing novel in the composition of this ink, as it is perfectly well known that the ingredients I have mentioned will constitute a material which will resist the action of fluoric acid. The novelty consists in the application of such inky composition to a glass or glassy surface by means of a pen or other drawinginstrument kept sufficiently hot to preserve the fluidity of such composition while the drawing is being made.

The pen that I use is a common steel writ-' ing-pen, and I believe any make will answer as well as another. I keep it hot, preferably, by passing a current of electricity from galvanic batteries, through insulated wires connected with them and arranged in the pen handle and holder, to the point of the pen, where the conducting-circuit is impaired and made sufficiently imperfect to cause the electricity to generate heat enough to melt the composition, or by connecting a very small gas pipe or tube to the pen to convey gas to a little gas-burner fixed in such a position under the pen as will allow its flame to impart to the pen the necessary amount of heat, or by fixing to the pen a small spirit or other lamp; but the lamp and its appurtenances must be so very minute that the pen to which they are fixed may be used without hinderance or inconvenience.

A brush or any other drawing-instrulnent that will carry the ink and that can be kept hot may be used as a substitute for the pen.

When the drawing has been completed on the glass or glassy surface, no matter whether it has been made as an ornament to an article or to be used as an engraving for typographi cal purposes, I cover such surface with fluoric acid, or with its equivalent-Sui phuric acid and finely-divided fiuor-sparuntil those parts not protected by the ink have been etched or engraved deep enough for the purpose required..

I then wash the whole with cold water. If the object has been simply ornamentation, the process is now complete; but if the object has been to prepare an engraving for typographical purposes, I take the engraved surface, which in this case should be on the face of a block of thick glass, cut it to the required size, bevel off the edges, and to prevent fracture mount and firmly secure it to a metal backing of any required thickness, by means of shellac, glue, or other sufficiently-adhesive substance. The-block is then complete, and may be printed from direct or from electro or stereo types, which can be taken from it as freely as from a wood block.

Having thus described the nature of my invention and the manner of performing same, I would have it understood that what I claim as new and of my invention is- The improved process of engraving on glass or glassy surfaces by drawing thereon with a hot pen or with any other heated drawing-instrument which melts and maintains fluid an ink capable of resisting the subsequent action of fluoric acid, substantially in the manner Enwn. WATERS, U. S. BAYSTON. 

